Bag making machine



Jan. 3, P HUNZlKER `BAGr MAKING MACHINE Filed Feb. e, 195o s sheets-shewJan. 3, 1933. P, HUNZ|KER y 1,893,285

A BAG MAKING MACHINE Filed Feb. 6, 1950 i 3 Sheets-Sheeo 2 IN VEN TOR.

A TTORNEY Jan.3,1933, RHUNZIKER 41,893,235

BAG MAKING MACHINE Filed Feb. e, les@ s sheets-sheet 5 IN V EN TOR.

ATTORNEY I WMM e Patented Jan. 3, 1933A UNITED STATES 'PATENT OFFICEPAUL HUN ZIKER, OF HAMILTON BEACH, NEW YORK, ASSIGNOR T0 POTDEVINMACHINE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF' NEW YORK BAGMAKING MACHINE Application led February 6, 1930. Serial No. 426,285.

This invention relates to an improvement in bag making machinery, andhas for one of its objects the provision of an improvement in thebottomin mechanism of such machines.

More speci cally the present invention provides vmeans whereby theaccidental application of paste to the folding bar employed in formingthe bottom of the bag is eliminated.

A still further obj ect of my invention is the provision of means foreliminating or reducing wear on the machine by the bottom foldingchains.

In prior ,machines employed in the manufacture of paper bags, it iscustomary to employ a bottom flap folding bar driven by the bottomfolding chains, such bar extending across the bag tube, and in thefolding opration trouble has been experienced with one of the bag bottomflaps wiping the bar, thereby applying paste to the bar which becomesdeposited on the outside of the succeeding tube. This of course spoilsthe bag and has been a source of annoyance to bag makers using thesemachines. The present invention remedies this defect.

Furthermore in paper bag. making machines of the general type to whichthis invention relates, the bottom a .foldin chains travel over and incontact with ,the rum by which the bag tube is fed, the chainstravelling at a different linear speed than the drum, with the resultthat the drum becomes worn. The present invention provides aconstruction wherein this wear is eliminated.

In the drawings accompanying this application: p

Fig. 1 is an elevational view partly in section of a portion of thebottoming mechanism 'of a bag making machine to which my invention hasbeen shown applied;

Fig. 2 is an end elevation ofthe bottoming mechanism;

Fig. 3 is a detail showing the means provided b this invention foreliminating wear on the rum;

Fig. 4 is a detail of the construction of Fig. 3;

Fig. 5 is a completed bag of the general type made on machines of thetype to which my invention relates; and

Figs 6, 7, 8 and 9 are views showing the different .stages of thebottoming operation. Referring to the drawings in detail: 1 des- 1gnatesthe drum of the machine by which the bag. tube is advanced through thebottomingV mechanism. 2 designates' the tucker mechamsm and 3 the pastefountain, neither of whlch devices is a part of the present inven- Eionbut shown merely for clarity of illustra- Mounted adjacent the peripheryof and at each end of the drum 1 is a stationary curved deflecting andwearing plate 4 fitting into a groove 5 formed inthe periphery of thedrum 1. i l

These deiiecting and wearing strips 4 are provided for the purpose ofproperly deflecting the bottom flap folding chains 6, and for preventingWear on the surface or periphery of the drum, these chains travelling ata faster linear speed than the drum 1. The chains are mounted onsprockets 7 and 8 on shafts 9 and 10, and as will beseen from Fig. 4 therollers 11 of the chains ride in contact with the strips 4, to bedeflected thereby, the strlps also preventing contact of the chains withthe drum periphery.

By this arrangement, therefore, all wear on the drum 1 from the chains 6is eliminated, and should the strips 4 become worn their replacement isinexpensive both in labor and materials.

The chains 6 carry'a bottom flat folding bar 12, this bar extendingacross the drum and engaging the bag tube 13, to' fold over the flap 14in the operation of forming the bag bottom. Prior to the operation ofthe bar 12, the bag stock has been pasted as shown at 15, and in priormachines it has been found that as the bar l2 advances after foldingover the flap 14 it is engaged by the pasted face of the cooperatingflap 14', with the result that some of the paste on this flap is appliedto the bar. This paste then becomes deposited on the outside of the nextbag tube, which of course is very objectionable.

In accordance with the present invention I provide an intermittentlyoperated folder plate 16 beyond the bar l2., This folder plate 16 iscarried on a bar 17 to which it is rigidly secured, the bar beingmounted in the side frames of the machine. Rigidly secured to the bar isan operating arm 19 provided at its remote end with a cam follower 2Oadapted to engage a driven cam 2l.

The cam 21 is mounted on ashaft 22 carrying a sprocket 23. This sprocketcarries a chain 24 passing over a sprocket 25 which is mounted on theshaft 9 carrying sprocket 7 above referred to.

The bottoming chains 6 are driven through a gear 26 on the shaft 27 ofdrum 1, this gear meshing with gear 28 in turn meshing with intermediategear 29 in mesh with a gear 30 on the shaft 10 which carries thesprocket 8. This drive for the bottoming chains also supplies a drivefor the cam shaft 22 through chain 24 and sprockets 23 and 25.

With the machine in operation, therefore, the cam 21 will rock the arm19 and effect a corresponding rocking motion of the folder plate 16.

From an inspection of Figs. 6 to 9, it will be seen that in operationthe folder bar 12 and follower folder 35 as they are driven in thedirection of the arrows on Fig. 1 will fold over the flap 14 and hold itin the position shown in Figs. 7 and 8, but that the flap 14 is notfolded over until the bar 12 has moved sufficiently to clear the flap,this flap 14 then being folded over by the folder plate 16 which is sotimed in its operation as to delay the folding of flap 14 until the bar12 has reached the position just noted. The folder plate 16 remains inthis position until the bag is rolled under roller 31 which holds thebottom in pasted position until delivered.

In Fig. 8 I have illustrated the plate or folder 16 in'its elevatedposition with the flap 14 in the process of being folded over, while inFig. 9 the tube has advanced t0 where the flap 14 is almost completelyfolded. The finished bag is shown in Fig. 5.

It will be seen from the foregoing, therefore, that I have provided anapparatus in which the flap 14 is folded by an intermittently moving camcontrolled folding plate 16 which is so timed in its operation as topermit bar 12 to advance sufficiently to clear the pasted face of theflap 14 before the flap is folded over, thereby eliminating allp0ssibility of the application of paste to the bar.

It will be seen also that wear on drum 1 by folding chains 6 has beenentirely eliminated.

1. In paper bag machines, the comblnation of a rotatable drum, bottomfolding chains overlying the drum adjacent each end thereof, fixed chaindefiecting means for each chain, said deflecting means lyingintermediate the chains and drum.

2. In paper bag machines, the combination of a rotatable drum, drivenbottom folding chains overlying the drum adjacent each end thereof, andfix-ed means overlyin the drum and engaged by the chains for de ectingsaid chains, said fixed means preventing engagement of the chains withthe drum.

.3. In paper bag machines, the combination of driven folding chains, afolder bar carried thereby for folding over one flap of a bag bottom,and a cam controlled driven folder for folding over another Hap 0f thegag bottom following the folding of the first 4. In paper bag machines,the combination of driven folding chains, a folder bar carried therebyfor folding over one flap of a bag bottom, and an intermittentlyoperated driven folder for folding over another flap of the bag bottomfollowing the folding of the first ap.

5. In paper bag machines, the combination of driven folding chains, afolder carried thereby for folding over one flap of a bag bottom, and anintermittently operated driven folder for folding over another flap ofthe bag bottom in'overlapping relation to the first flap, the folding ofthe second flap being delayed until the first folder has moved to aposition beyond the end of the second flap to avoid engagement of the.second flap with the first folder.

6. In paper bag machines, the combination of driven folding chains, afolder carried thereby for folding over a flap of a bag hottom, a seconddriven folder for folding over another flap of the bag bottom inoverlapping relation to the first flap, said folders traveling inarcuate paths in opposite directions, the second folder functioning tofold its flap after the first folder has moved out of the path of thesecond flap.

7. In paper bag machines, the combination cf driven folding chains, afolder carried thereby and extending across a bag tube, means foradvancing the bag tube and folder at different linear speeds to effect afolding of a flap of the bag bottom, a second folder for folding asecond Hap in the bag bottom, and means for intermittently moving saidsecond folder into folding position, the movement of the second folderbeing delayed until the first folder has been moved out of the path ofthe second flap.

This specification signed this 81 day of January, 1930.

PAUL HUNZIKER.

